Compute expected value and standard deviation. Fill in the missing quantity. Refer to image below.

According to a study, the probability that a randomly selected teenager shopped at a mall at least once during a week was 0.63. Let X be the number of students in a randomly selected group of 50 that will shop at a mall during the next week. (a) Compute the expected value and standard deviation of X. (Round your answer to two decimal places.) Hint [See Example 5.] expected value standard deviation (b) Fill in the missing quantity. (Round your answer to the nearest whole number.) There is an approximately 2.5% chance that or more teenagers in the group will shop at the mall during the next week